Hemingray Glass Insulator
The Hemingray Glass Company was an American glass manufacturing company founded by Robert Hemingray and Ralph Gray in Cincinnati in 1848.Hemingray was best know...
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The Hemingray Glass Company was an American glass manufacturing company founded by Robert Hemingray and Ralph Gray in Cincinnati in 1848.Hemingray was best known for producing telegraph and telephone pin insulators used on utility poles. Wikipedia
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